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A model was set up for adsorption systems obeying the Temkin isotherm, in which both the lateral interaction between the adsorbed molecules and the energetic surface heterogeneity in adsorption were quantitatively described and then characterized by parameters, respectively. On the basis of this model, by using the ensemble theory in statistical mechanics as a theoretical tool, was derived the Temkin isotherm, in the form of 6 = ( R T / a ) ln(AP), its validity being examined both theoretically and experimentally. The derived statistical mechanical expression for the Temkin isotherm established the relation between the constants A and (Y and the microscopic properties of the adsorbed molecules, including the parameter of lateral interaction and the parameter of surface heterogeneity in adsorption, as proposed in the model. It was with this relation that these parameters were evaluated from the experimental data of the chemisorption of hydrogen on iron films. From the evaluated parameter of lateral interaction was further evaluated the molar lateral interaction energy between the adsorbed hydrogen molecules on iron films, the value of which was compared with that estimated from a Lennard-Jones (12, 6 ) potential.

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